Expanding-shaft.



Patented Mar. 28, 1916.

D. H. REGAN.

EXPANDING SHAFT.

APPLICATION FILED IuIY I4, I9I4.

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DAVID H. nEGAN, or `wanronn, MASSACHUSETTS.

EXPANDING-SHAFT.

Specicaton of Letters Patent. p Patented iwal'. 23, 1916.

` Application filed July 14, 1914. Serial No. 850,997'.

To all whom t may concern Be it known `that l, DAVID H. REGAN, citizen of the United States, residing at Walpole, county of NorfollnState of Massachusetts, have invented an Improvement in Expending-Shafts, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention has for an object to provide an expansible roll or mandrel of improved construction for use as a core or arbor on which to wind paper or other material and aims to provide a mandrel of this character which will be simple in construction, easily expanded and contracted and one which when expanded willbe locked to prevent accidental collapse.

Theinvention has also for an object to provide a mandrel of this character, in which the radially movable segments will have no longitudinal movement.

`With these and other objects in view, the invention consists in certain novel features of construction and combination of parts as hereinafter set forth and pointed out in the claims. Y

Referring to the drawings in which I have illustrated a selected embodiment of my invention, Figure 1 is a cent'ral longitudinal section of the device; Fig. 2 is a sectional view taken on the line 2 2 Fig. 1; Fig. 3 is an elevation in detail of the cone operating means, illustrating the position of the parts when the mandrel is contracted, and F ig. 4 is a similar view showing the parts in position when the mandrel is expanded.

Referring to the drawings in detail, 1 designates a central spindle or shaft around which a plurality of radially movable segments are positioned there being four such segments 2, 3, 4 and 5 in this embodiment of the invention. Each segment is carried by a pair of studs 6, Slidable in holes 7, drilled transversely of the spindle, 1. It is to be noted `that the several holes 7, are spaced sutliciently from each other to avoid unnecessary weakening of the Spindle. The segments are drawn toward the spindle by springs 8, which encircle the studs and bear against the spindle and against collars 9 held in place on the studs as by pins 10. The spindle is preferably recessed as indicated at 11 to receive the inner ends of the springs.

Suitable means are provided operating in opposition to the Springs to expand the segments when desired. For this purpose I prefer to provide'similar curved segmental blocks 12, 13 firmly secured in opposite ends of said segment as by rivets 14 and beveled on their inner faces to present cam surfaces 15, 1G, and expanding cones 17, 1S which cooperate with the blocks 15, 16 and means to move the cones longitudinally of the spindle. Two sets of blocks only are illustrated but it will be obvious that more may be provided for long rolls if desired. The blocks serve two purposes. They reinforce the segments to provide rigidity and provide cam surfaces with which the expanding cones 17, 18 coperate to expand the segments in opposition to the springs 8. The arrangement of the parts in the structure illustrated is such that the cones extend in the same direction and operate simultaneously. Accordingly, thecones are rigidly connected by rods 20, 21. These cones are preferably splined to the spindle as indicated at 22, 28.

I have shown an improved mechanism for causing longitudinal movement of the cones which operates positively to force the cones. in the direction to expand the segment and provides a lock to prevent slipping. This mechanism in its preferred form comprises a pair of relatively rotatable cams or collars 24, 25, the collar 24 being splined to the spindle as indicated at 2H and the collar 25 being rotatable, but being prevented from moving longitudinally toward the end of the spindle by a iixed collar 27 secured to the spindle as by a taper pin 28. The collars 24, 25 are provided with coperating cam projections or lugs 30, 31 respectively, arranged so that when the collars 24, 25 are turned relative to each other from the position shown in Fig. 3 to the position shown in F ig. 4, the engagement of the cam projections will force the collar 24 longitudinally of the spindle thereby forcing the'expanding cones 17, 18 forward against the segmental blocks 12, 18 to expand the segments. Longitudinal movement of the segments is prevented by the engagement of the studs 6 in the holes 7 wherefore as the cones move forward the segments are forced radially outward. Any convenient means may be provided for rotating the rotatable collar 25. I have indicated holes 33, to receive an operative tool for this purpose.

Suitable means are provided to cause the segments to be locked in expanded position while the roll is in use. In the construction illustrated the lugs 31 are notched at their ends as indicated at 32 to receive the ends of the lugs 30 thus providing a lock to prevent accidental rotation of the collar 25 and consequent collapse of the roll.

I have shown a journal bearing at one end of the spindle to coperate with a suitable bearing of the machine to hold the roll in position, this bearing being so constructed that it may be removed when worn and a new bearing substituted. In the form shown this bearing comprises collars 34:, 35 and 36 rigidly secured to the spindle by tapered pins. The particular construction however, may be modified to suit the requirement of the machine upon which the device is to be used.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. An expansible roll comprising a central spindle, a plurality of transversely curved radially movable segments exterior to said spindle, pins secured to the segments and extending transversely through the spindle, springs acting on said pins and tending to contract said segments, curved segmental blocks beveled at their inner faces to present cam surfaces secured to the op posite ends of said segments, a pair of rigidly connected cones slidable upon said spindle and coperating with said cam surfaces and means to move said cones longitudinally comprising relatively rotatable collars mounted on said spindle and having coperating beveled cam lugs, the lugs on one member being recessed at their ends to receive the ends of the coperating lugs to hold the parts locked in position when the roll is expanded.

2. An expansible roll comprising a central spindle, pairs of pins or studs eXtending loosely through the spindle in a transverse direction, a segment rigidly connected to the outer ends of the pins of each pair whereby radial movement of the segments is permitted and longitudinal movement thereof is prevented, springs mounted on the inner ends of said studs and operatingl to draw said segments toward the spindle, a pair of connected cones slidably mounted on the spindle, segmental blocks secured to the segments and presenting cam surfaces cooperating with said cones, and means to move the connected conesv longitudinally thereby to Yexpand said segments in opposition to said springs.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

DAVID H. REGAN.

Witnesses EMMA E. HARMON, FRANCIS SUTHERLAND.

Copies of this patent may be obtained for five cents each, by addressingl the Commissioner of Patents, Washington, D. C. 

